Saturday, NASA’s Mars Science Labratory (MSL) will launch a 191-foot-tall Atlas V rocket, carrying the MSL Rover, to begin its mission to Mars.The MSL Rover, named Curiosity, will be the first-ever pricision landing – using a guided entry system – on Mars. To learn more about the mission, make sure to read NASA’s full press release for the event. To watch the launch, check out the UStream below.The launch will occur at 10:02 EST. Streaming live video by Ustream